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Class D audio power amplifier with fine hysteresis control

Class D audio power amplifier with fine hysteresis control

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A new simple and efficient control method for a class D audio power amplifier is presented. The new fine hysteresis control method can control the switching frequency freely and guarantees stability for any load condition without having any outside compensation circuit at all.

Inspec keywords: frequency control; feedback amplifiers; power amplifiers; audio-frequency amplifiers; hysteresis; bang-bang control

Other keywords: fine hysteresis control; load condition stability; switching frequency; inductor current sensing; switching power amplifiers; class D audio power amplifier; bang-bang control; feedback loop

Subjects: Amplifiers; Frequency control; Audio equipment and systems; Control applications in video and audio techniques

References

    1. 1)
      • N.S. Jung , J.H. Jeong , G.H. Cho . High efficiency and high fidelity analogue/digital switching mixed mode amplifer. Electron. Lett. , 828 - 829
    2. 2)
      • Lai, Z., Smedley, K.M.: `A low distortion switching audio power amplifier', IEEE PESC, 1995, Atlanta, CA, USA, p. 174–180.
    3. 3)
      • Dondon, P., Micouleau, J.M.: `An original approach for the design of a class D power switching amplifier-an audio application', Proc. IEEE of ICECS, 1999, Pafos, Cyprus, Greece, p. 161–164.
    4. 4)
      • Marshall, A., Devore, J.: `Dual switch-mode regulator IC', IEEE ISSCC'95, 1995, San Francisco, CA, USA, p. 52–53.
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